﻿using System;

namespace 汽车类
{
    class Program
    {
        static void Main(string[] args)
        {
            Vehicle v = new Vehicle();
            Car c = new Car();
            Truck t = new Truck();
            //c.Wheels = 18;
            //c.weight = 180;
            v.xx();
            c.xx();
            t.xx();
        }
    }
}
